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AVAudioEngineでリアルタイムレンダリング
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Yuki Yasoshima
September 20, 2020
Programming
910
1
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AVAudioEngineでリアルタイムレンダリング
iOSDC Japan 2020
Yuki Yasoshima
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Transcript
:VLJ:BTPTIJNB!ZBTP@TBO "7"VEJP&OHJOFͰ ϦΞϧλΠϜϨϯμϦϯά J04%$+BQBO
༰ ΦʔσΟΦೖग़ྗͷΈ J04ͷΦʔσΟΦ"1* ҆ఆͯ͠ϦΞϧλΠϜʹϨϯμϦϯάΛ͢Δʹ IUUQTHJUIVCDPNPCKFDUJWFBVEJP"VEJP6OJU3FOEFSJOH&YBNQMF αϯϓϧίʔυ
ΦʔσΟΦೖग़ྗͷΈ
ίʔϧόοΫ ΦʔσΟΦೖग़ྗͷΈ ΦʔσΟΦॲཧΛ։࢝͢Δͱઐ༻ͷεϨουͰ܁Γฦ͠ίʔϧόοΫ͕ݺΕΔ ʢඵʹ͖ͭेճҎ্ʣ
ίʔϧόοΫ ग़ྗ ΦʔσΟΦೖग़ྗͷΈ ίʔϧόοΫͰσʔλΛ͢ͱԻ͕ग़ྗ͞ΕΔ
ίʔϧόοΫ ग़ྗ ೖྗ ΦʔσΟΦೖग़ྗͷΈ ίʔϧόοΫʹೖྗ͞ΕͨԻͷσʔλ͕ͬͯ͘Δ
ίʔϧόοΫ ग़ྗ ೖྗ ΦʔσΟΦೖग़ྗͷΈ ❌ ίʔϧόοΫͷॲཧʹ͕͔͔࣌ؒΔͱɺԻ్͕ΕͨΓऔΓ͜΅ͨ͠Γ͢Δ͜ ͱʹͳΔ
"7"VEJP1MBZFSɾ"7"VEJP3FDPSEFSͳͲͷߴϨϕϧͳ"1*ɺ͜ͷΑ͏ͳϨ ϕϧॲཧΛؾʹ͠ͳͯ͘؆୯ʹ͑ΔΑ͏ʹͳ͍ͬͯΔ ϦΞϧλΠϜʹࣗ༝ʹԻΛѻ͍͍ͨ߹ɺϨϕϧͳॲཧΛ͢Δඞཁ͕͋Δ ΦʔσΟΦೖग़ྗͷΈ
J04ͷΦʔσΟΦ"1*
J04ॳظͷࠒ͔Β͋Δ$ݴޠͷ"1* $BSCPODPNQPOFOUCBTFE"VEJP6OJUT "6(SBQI "VEJP2VFVF4FSWJDFT
ඇਪʹͳͬͨ"1* J043FMFBTF/PUFTΑΓ "6(SBQIʢʙJ04ʣ *OUFS"QQBVEJPʢʙJ04ʣ $BSCPODPNQPOFOUCBTFE"VEJP6OJUTʢ͍ۙ͏ͪʹ͑ͳ͘ͳΔʣ
Ճ͞Εͨ"1* "7"VEJP&OHJOFʢJ04ʙʣ "VEJP6OJU7"VEJP6OJU&YUFOTJPOTʢJ04ʙʣ "7"VEJP4PVSDF/PEF"7"VEJP4JOL/PEFʢJ04ʙʣ
J04ҎલͷϦΞϧλΠϜϨϯμϦϯά $ݴޠͷ"VEJP6OJU "6"VEJP6OJUΛܧঝ͢Δ͜ͱͰ"7"VEJP&OHJOFͰՄೳʹͳΔʢϓϥάΠϯ ͷΈͰ࡞ΔͷͰɺηοτΞοϓ͕໘Ͱෳࡶʣ
"7"VEJP4PVSDF/PEF"7"VEJP4JOL/PEF͕ొ ϓϥάΠϯͱൺͯηοτΞοϓ͕༰қʹͳͬͨ J04Ҏ߱ͷϦΞϧλΠϜϨϯμϦϯά
"7"VEJP4PVSDF/PEF ΦʔσΟΦΛग़ྗ͢ΔσʔλΛ͢ 4PVSDF/PEF 0VUQVU/PEF "7"VEJP&OHJOF 3FOEFS #MPDL @interface AVAudioSourceNode :
AVAudioNode <AVAudioMixing> - (instancetype)initWithRenderBlock:(AVAudioSourceNodeRenderBlock)block; - (instancetype)initWithFormat:(AVAudioFormat *)format renderBlock:(AVAudioSourceNodeRenderBlock)block; @end
"7"VEJP4JOL/PEF ΦʔσΟΦͷೖྗ͞ΕͨσʔλΛड͚औΔ *OQVU/PEF 4JOL/PEF "7"VEJP&OHJOF 3FDFJWFS #MPDL @interface AVAudioSinkNode :
AVAudioNode - (instancetype)initWithReceiverBlock:(AVAudioSinkNodeReceiverBlock)block; @end
҆ఆͨ͠ϨϯμϦϯάΛߦ͏
ΦʔσΟΦ*0ͷεϨουʹ͓͍ͯ ϝϞϦͷ֬อΛ͠ͳ͍ MJCEJTQBUDIΘͳ͍ $$ ͰॲཧΛॻ͘ "DDFMFSBUF'SBNFXPSLΛ׆༻͢Δ ଞͷεϨουͱͷϩοΫΛආ͚Δʢ4XJGU0CKFDUJWF$ͷݺͼग़͠ɺϑΝΠϧ ೖग़ྗͷதʹ͋Δʣ IUUQTQPTUEDDGPVSDPNNPONJTUBLFTJOBVEJPEFWFMPQNFOU
αϯϓϧίʔυ "7"VEJP4PVSDF/PEFαΠϯͷ࠶ੜ ʲ%JSFDUʳपͷૢ࡞Λ͙͢ʹө ʲ%FGFSSFEʳཷΊ͍ͯΔόοϑΝʹରͯ͠पͷૢ࡞Λө "7"VEJP4JOL/PEFೖྗԻͷϝʔλʔදࣔ IUUQTHJUIVCDPNPCKFDUJWFBVEJP"VEJP6OJU3FOEFSJOH&YBNQMF
αϯϓϧίʔυͷݴޠߏ 3FOEFS#MPDL3FDFJWFS#MPDLͷத$ Ͱهड़ 0CKFDUJWF$Ͱϥοϓͯ͠/PEFΛฦ͢ "7"VEJP&OHJOFͷߏங6*4XJGUͰهड़
εϨουؒͷΓͱΓ
TUEBUPNJD ಛ ܕɾුಈখܕɾϙΠϯλܕΛεϨουηʔϑʹѻ͑ΔΫϥε JT@MPDL@GSFF ؔͰϩοΫ͞ΕΔ͔औಘͰ͖Δʢࠓ࣌ͷσόΠεͳΒ·ͣ USVFʣ
ෳͷΛΞτϛοΫʹ͢Δ ڞ༻ମͰTUEBUPNJDͷܕͱTUSVDUΛม union Value { void *v; struct { float
const level; float const peak; }; }; static_assert(sizeof(Value) == sizeof(void *), "");
ෳͷΛΞτϛοΫʹ͢Δ ڞ༻ମͰTUEBUPNJDͷܕͱTUSVDUΛม std::atomic<void *> atomicValue; // atomicͷʹηοτ͢Δ Value setValue{.level =
0.0f, .peak = 0.0f}; atomicValue = setValue.v; // atomicͷ͔Βήοτ͢Δ Value getValue{.v = atomicValue};
TUETIBSFE@QUS ಛ $ ͷΫϥεΛࢀরΧϯτํࣜͰอ࣋͢Δ ࢀরΧϯλεϨουηʔϑ ϨϯμϦϯάதʹίϐʔ͠ͳ͍Α͏ʹؾΛ͚ͭΔ
TUETIBSFE@QUS ίϐʔͯ͠͠·͏ॻ͖ํ void sample(std::shared_ptr<SineData> data) { auto localData = data;
} ίϐʔ͞ΕΔ ͭղ์͞ΕΔ ίϐʔ͞ΕΔ
TUETIBSFE@QUS ίϐʔ͞Εͳ͍ॻ͖ํ void sample(std::shared_ptr<SineData> const &data) { auto const &localData
= data; } ίϐʔ͞Εͳ͍ ίϐʔ͞Εͳ͍ Կى͖ͳ͍
ͭͷεϨου͔Βಉ͡σʔλʹॻ͖ࠐΉ %FGFSSFEͷαϯϓϧ
ͭͷεϨου͔Βಉ͡σʔλΛѻ͏ %FGFSSFEͷαϯϓϧ αΠϯੜεϨου αΠϯΛ ॻ͖ࠐΈ ग़ྗόοϑΝʹ ಡΈࠐΈ ڞ༗͢Δσʔλ ͭ ࠷ޙ·ͰಡΈࠐΜͩΒ
ಡΈࠐΈݩΛΓସ͑ αΠϯͷ ॻ͖ࠐΈΛࢦࣔ ඵؒͷ ΦʔσΟΦσʔλ ग़ྗεϨου
ͭͷεϨου͔Βಉ͡σʔλΛѻ͏ %FGFSSFEͷαϯϓϧ αΠϯੜεϨου 8SJUJOH 3FBEJOH ΞτϛοΫͳϑϥά 8SJUJOHͳΒ αΠϯΛॻ͖ࠐΜͰ 3FBEJOHʹ͢Δ 3FBEJOHͳΒ
ग़ྗόοϑΝʹ σʔλΛಡΈࠐΜͰ ࠷ޙ·ͰߦͬͨΒ 8SJUJOHʹ͢Δ ڞ༗͢Δσʔλ ͭ ඵؒͷ ΦʔσΟΦσʔλ ग़ྗεϨου
·ͱΊ $ݴޠͷ"1*ඇਪɻ࣌"7"VEJP&OHJOF ΦʔσΟΦͷεϨου͕ϩοΫͯ͠͠·Θͳ͍Α͏ʹؾΛ͚Δ